Update upgrade/breaking-changes/7-0-0.md

Co-authored-by: Dimo Dimov <[email protected]>

Author: xristianstefanov

upgrade/breaking-changes/7-0-0.md

@@ -43,7 +43,7 @@ The obsolete `ClearButton` parameter is removed. Use `ShowClearButton` instead.
 * The obsolete `AutoFitColumn()` method is removed. [Use `AutoFitColumnAsync()`]({%slug components/grid/columns/resize%}#autofit-columns) instead.
 * The obsolete `AutoFitColumns()` method is removed. Use `AutoFitColumnsAsync()` instead.
 * The obsolete `AutoFitAllColumns()` method is removed. Use `AutoFitAllColumnsAsync()` instead.
-* When using grouping and `OnRead`, casting the `DataSourceResult.Data` to a list of objects (`.Cast<object>().ToList();`) is no longer needed.
+* When using [grouping and `OnRead`]({%slug components/grid/manual-operations%}#grouping-with-onread), casting `DataSourceResult.Data` to a list of objects (`.Cast<object>()`) is no longer needed.
 
 ## TextArea